Yellowtail Sashimi Recipe

Chill and prepare

Place the sashimi-grade yellowtail in the coldest part of the refrigerator for at least 15–20 minutes before slicing. If the fish was previously frozen, ensure it is fully thawed and kept chilled on ice until ready to slice.

Trim and portion

Using a very sharp, long sashimi or filleting knife, pat the fish dry with paper towels. Trim away any silver skin, bloodline, or connective tissue from the loin. Cut the loin into two manageable portions across the grain (so you can slice with the grain appropriate for texture).

Slice sashimi

Hold the fish steady with your non-dominant hand. With the knife angled slightly away from you, make single smooth strokes to cut 1/4"–3/8" (0.6–1.0 cm) thick slices. Aim for even slices about 2"–2.5" (5–6 cm) long. Arrange slices on a chilled plate with slight overlap or fan them out.

Prepare jalapeño

Remove the stem from the jalapeño. For moderate heat, slice very thin rounds (use a mandoline or a sharp knife). If you prefer milder heat, remove seeds and membranes before slicing. Reserve a few whole thin rounds for garnish and some finely chopped for the ponzu if desired.

Finish garnishes

Thinly slice the scallion green into fine slivers on the diagonal. Lightly toss cilantro leaves with a pinch of kosher salt to bruise them and release aroma. Zest a small amount of lime and cut the lime into wedges for serving.

Assemble ponzu

In a small bowl combine 1/2 cup ponzu, 1 tsp soy sauce, 1 tsp rice vinegar, 1 tsp mirin (optional), 1/2 tsp grated fresh ginger, and 1/4 tsp sesame oil. Stir to combine. Taste and adjust: add up to 1 tbsp more ponzu for brightness or a pinch of sugar/mirin if you prefer sweeter balance.

Optional jalapeño infusion

If you want a jalapeño-ponzu, add 1–2 thin jalapeño rounds (or 1 tsp finely chopped jalapeño for more heat) to the ponzu and let it sit for 5–10 minutes to infuse. Remove larger rounds before serving or leave them in for presentation.

Plate and dress

Arrange the yellowtail slices on a chilled serving plate. Spoon or lightly brush the ponzu across the slices — about 1–2 tsp ponzu per slice depending on size (reserve extra in a small dipping bowl). Scatter jalapeño rounds and thin scallion slivers over the fish. Sprinkle toasted sesame seeds and the bruised cilantro leaves. Finish with a few drops of fresh lime juice and a tiny drizzle of sesame oil if desired.

Serve

Serve immediately with extra ponzu in a small dipping bowl and lime wedges at the side. Eat within 30 minutes of plating for best texture and temperature.